Discussion
Which of the following gaseous mixture has the highest flame temperature ?
Answer: A
The highest flame temperature comes from acetylene + oxygen.
The oxy-acetylene flame reaches about 3,100 degrees Celsius, which is why it is used for welding and cutting steel.
Acetylene with nitrous oxide reaches about 2,700 to 2,950 degrees, used in atomic absorption for elements that need a hot flame. Hydrogen with nitrous oxide is a little cooler, and acetylene with air reaches only about 2,300 degrees, because the nitrogen in air absorbs heat.
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